Edge Content Caching for Low-Latency Interactive Streaming
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Solution Overview
Problem
Existing content streaming systems for interactive content, such as videogames, suffer from high latency due to geographical separation between primary servers and users, as edge servers merely act as relays for live content, which is not suitable for interactive content that is generated in real-time in response to user inputs.
Innovation Solution
Implementing an edge server system that caches pre-recorded or predictable content, such as cut-scenes, audio, and static game environments, and dynamically generates only the interactive components, reducing the data stream from the primary server to minimize latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If edge servers are deployed to cache content from primary servers, then latency for users is reduced, but the system is not suitable for interactive content where content is generated in real-time in response to user inputs
Solution Approach 1:
The content delivery system is segmented into two distinct paths: a unidirectional cache path for non-interactive content (cutscenes, audio, static environments) from primary servers to edge servers, and a bidirectional interactive path for real-time game state data between edge servers and clients. This segmentation allows each path to be optimized for its specific purpose, resolving the contradiction between latency reduction and interactive content suitability.
Solution Approach 2:
The edge server acts as an intermediary that receives and caches non-interactive content from primary servers while simultaneously handling real-time interactive content delivery to clients. This intermediary role allows the system to provide both cached content benefits and real-time interactivity through a single distributed node, resolving the suitability contradiction.
2Adaptability or versatility
If all interactive content is streamed from primary servers to clients, then content generation responsiveness is maintained, but geographical separation causes acute latency problems
Solution Approach 1:
The system implements local quality by deploying edge servers in geographically distributed locations closer to end users. These local edge servers cache non-interactive content and handle real-time interactive content delivery, providing locally-optimized performance that reduces geographical latency while maintaining content generation responsiveness through the bidirectional communication path.
3Loss of energy
If edge servers act as passive stores for copied content, then bandwidth is freed at primary servers, but the system cannot handle interactive content requiring real-time generation
Solution Approach 1:
The edge server system implements dynamics by transitioning from static passive caching to dynamic active participation in real-time content delivery. Edge servers dynamically receive, cache, and retransmit both non-interactive cached content and real-time interactive content based on client requests and game state changes, allowing the system to adaptively handle mixed content types while optimizing bandwidth usage at primary servers.
Data Source
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AI summary
An interactive content provision system comprises a primary server configured to generate interactive content, and to stream generated interactive content to an edge server, and an edge server configured to receive generated interactive content from the primary server, and stream it to a client device; wherein the edge server is further configured to store at least some cached content, being predetermined content of the interactive content generated by the primary server, the edge server is configured to receive data from the primary server indicating a cached content for provision to the client device by the edge server, and the edge server is configured to provide streamed generated interactive content and indicated cached content to the client device.